What are some methods (e.g weekly company-wide emails) that the PMM team helps to keep the entire company informed on what was released this past week/month and the upcoming releases? How do you get the Product teams to help contribute to these updates?

I believe that it’s the PMM’s responsibility to make sure your internal teams are informed about a release. If your internal teams aren’t well-versed in what’s new, how do you expect your external customers to be?

Some things we currently do: 

• Setup Slack channel(s) for release updates and launches that everyone at the company can join and follow along
• Enable sales, support, success (basically any customer-facing team) at an opportune learning time (their time zone, not Monday mornings or Friday afternoons). For a release that introduces substantial change to the product, processes, or customer experience, you may need to do multiple enablement sessions. For smaller updates, a short Slack post in the sales team channel will do. 
• Dog food your own feature. The best internal communication and marketing tool is using your own feature.
• Get your whole company excited. I am a big believer in internal marketing before a public launch. So you can think about doing things like presenting at lunch and learns/all hands, making posters, or organizing an internal celebration.  

As we get bigger, I would probably introduce things like internal newsletters and more in-depth enablement programs and certifications.